[vsnet-grb-info 2297] GRB051021: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4136
SUBJECT: GRB051021: Swift/UVOT Upper Limits
DATE:    05/10/22 17:01:06 GMT
FROM:    Peter Brown at PSU  <pbrown at astro.psu.edu>

P. J. Brown (PSU), D. Fox (PSU), M. Trippico (GSFC-SSAI),
J. Nousek (PSU),  & N. Gehrels (GSFC)
on behalf of the Swift/UVOT team report:

The Swift-UVOT began observing the field of
GRB 051021 (HETE Trigger H3947; Yoshida et al. GCN 4116)
at 2005-10-21 16:28:27, about 3 hours after the burst.

No source is detected at the position of the optical
counterpart found by Fox, McNaught, & Peterson (GCN 4120)
in any of our 6 filters down to the following 3-sigma
upper limits:

Filter  T_range(hours)  Exp(sec)  3sigUL

V       3.36-8.34       1988      20.2
B       5.30-6.71       1304      21.1
U       5.04-5.29        900      20.5
W1      4.79-5.04        900      20.8
M2      3.61-3.80        900      20.9
W2      3.11-6.96       1800      21.7

Where T_range is time post-trigger.